This page is dedicated to the repair and/or modification of vintage test equipment and radio receivers/transceivers.
I will also describes the circuits of some “landmark” equipment.
AOR AR-3000 Troubleshooting – PLL error
The Problem My AR3000 has been in occasional use for 30+ years. Several months ago it failed to start. Pushing the power button resulted in no sound and the icon “PLL ERR” showed up in the LCD screen. Diagnosis and Repair I had the gut feeling that the problem was due to faulty electrolytic capacitors.…
Tektronix 494P Spectrum Analyzer Repair – Display blank
Several months ago I fixed the video offset problem of my HP8562A. (See the post: HP8562A Spectrum Analyzer Repair: Fixing Video Offset / Display Issues. ) Last week my Tek 494P refused to work – the display was blank after power on. A quick diagnosis revealed the following: Troubleshooting I remove the instrument cover to…
HP8562A Spectrum Analyzer Repair: Fixing Video Offset / Display Issues
The Problem My HP8562A has been in excellent condition for many years until one day when I powered it up, the displayed trace was weird. The whole spectrum display was shifted up, as shown in Fig.1. Trying to display the built-in cal. signal further confirmed the problem. The photo below showed the 300MHz cal. signal,…
From Hobby to Professional 